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Multipurpose: swivel hood for venting ducts, chimneys and exhaust units Lacing provides maximum protection without compromising chimney performance Thickened 304 stainless steel: strong and chimney hood cover pot cover, rotating fume hood, suitable for most standard fume hoods, preventings wind and increasing ventilation Principle: The cap uses the natural wind and air heat convection caused by the temperature difference between indoor and outdoor to drive the turbines to rotate Rainproof and noiseless: the curved fan blade encrypted blade can ensure that rain never invades in the working state. High exhaust efficiency Can run lightly. Chimney rotating hood Variable angle neck pipe: It can makes the ventilator installed at will under 0- 22.5 degree slope. Galvanized bearings, which are strong enough to withstand 200km/h wind speed and 100KG load pressure without deformation and damage Manufacturer VSKXFDDB